There is suburb house where only 4G internet is available. There is no possibility to get fixed IP due to GSM provider security reasons and there is no way to get access through HA cloud. It merely does not work.
The task is to control heating using HA, i.e. turn SonOff switches on and off and read a couple of temperature sensors.
Are there any alternative HA access methods? Is it possible to send/receive on/off commands through a messenger? Telegram or any other?
How, if it is possible?
Any input would be really appreciated.